That info was based on TestLive server and req was changed with 17.9.1. patch. Still, I'll need some time to get parts and check req again. Or maybe just roll engi and level him, seems they are new love profession.

Infused Solar-Powered Master Engineer Pistol + Crude Upgrade Kit = Augmented Master Engineer Pistol

This process require 1.5k Weapon Smithing, 2.7k Mechanical Engineering and 2.7k Electrical Engineering skill to build

The skill requirement for building this isn't correct. I dont have 2.7k in either and upgraded the Engi positol no problems. I'm not sure how much skill is required though but if I find out I'll post again. Might just be an idea to make people aware that they don't need this requirement as of the patch going live. I think it's likely to have same build requirements as the last engi pistol upgrade.